sound/core/pcm.c

   1 /*
   2  *  Digital Audio (PCM) abstract layer
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  *
  20  */
  21
  22 #include <sound/driver.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.h>
  26 #include <sound/core.h>
  27 #include <sound/minors.h>
  28 #include <sound/pcm.h>
  29 #include <sound/control.h>
  30 #include <sound/info.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>, Abramo Bagnara <abramo@alsa-project.org>");
  33 MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
  34 MODULE_LICENSE("GPL");
  35
  36 snd_pcm_t *snd_pcm_devices[SNDRV_CARDS * SNDRV_PCM_DEVICES];
  37 static LIST_HEAD(snd_pcm_notify_list);
  38 static DECLARE_MUTEX(register_mutex);
  39
  40 static int snd_pcm_free(snd_pcm_t *pcm);
  41 static int snd_pcm_dev_free(snd_device_t *device);
  42 static int snd_pcm_dev_register(snd_device_t *device);
  43 static int snd_pcm_dev_disconnect(snd_device_t *device);
  44 static int snd_pcm_dev_unregister(snd_device_t *device);
  45
  46 static int snd_pcm_control_ioctl(snd_card_t * card,
  47                                  snd_ctl_file_t * control,
  48                                  unsigned int cmd, unsigned long arg)
  49 {
  50         unsigned int tmp;
  51
  52         tmp = card->number * SNDRV_PCM_DEVICES;
  53         switch (cmd) {
  54         case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
  55                 {
  56                         int device;
  57
  58                         if (get_user(device, (int __user *)arg))
  59                                 return -EFAULT;
  60                         device = device < 0 ? 0 : device + 1;
  61                         while (device < SNDRV_PCM_DEVICES) {
  62                                 if (snd_pcm_devices[tmp + device])
  63                                         break;
  64                                 device++;
  65                         }
  66                         if (device == SNDRV_PCM_DEVICES)
  67                                 device = -1;
  68                         if (put_user(device, (int __user *)arg))
  69                                 return -EFAULT;
  70                         return 0;
  71                 }
  72         case SNDRV_CTL_IOCTL_PCM_INFO:
  73                 {
  74                         snd_pcm_info_t __user *info;
  75                         unsigned int device, subdevice;
  76                         snd_pcm_stream_t stream;
  77                         snd_pcm_t *pcm;
  78                         snd_pcm_str_t *pstr;
  79                         snd_pcm_substream_t *substream;
  80                         info = (snd_pcm_info_t __user *)arg;
  81                         if (get_user(device, &info->device))
  82                                 return -EFAULT;
  83                         if (device >= SNDRV_PCM_DEVICES)
  84                                 return -ENXIO;
  85                         pcm = snd_pcm_devices[tmp + device];
  86                         if (pcm == NULL)
  87                                 return -ENXIO;
  88                         if (get_user(stream, &info->stream))
  89                                 return -EFAULT;
  90                         if (stream < 0 || stream > 1)
  91                                 return -EINVAL;
  92                         pstr = &pcm->streams[stream];
  93                         if (pstr->substream_count == 0)
  94                                 return -ENOENT;
  95                         if (get_user(subdevice, &info->subdevice))
  96                                 return -EFAULT;
  97                         if (subdevice >= pstr->substream_count)
  98                                 return -ENXIO;
  99                         for (substream = pstr->substream; substream; substream = substream->next)
 100                                 if (substream->number == (int)subdevice)
 101                                         break;
 102                         if (substream == NULL)
 103                                 return -ENXIO;
 104                         return snd_pcm_info_user(substream, info);
 105                 }
 106         case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
 107                 {
 108                         int val;
 109
 110                         if (get_user(val, (int __user *)arg))
 111                                 return -EFAULT;
 112                         control->prefer_pcm_subdevice = val;
 113                         return 0;
 114                 }
 115         }
 116         return -ENOIOCTLCMD;
 117 }
 118 #define STATE(v) [SNDRV_PCM_STATE_##v] = #v
 119 #define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
 120 #define READY(v) [SNDRV_PCM_READY_##v] = #v
 121 #define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
 122 #define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
 123 #define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
 124 #define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
 125 #define START(v) [SNDRV_PCM_START_##v] = #v
 126 #define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
 127 #define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
 128
 129 static char *snd_pcm_stream_names[] = {
 130         STREAM(PLAYBACK),
 131         STREAM(CAPTURE),
 132 };
 133
 134 static char *snd_pcm_state_names[] = {
 135         STATE(OPEN),
 136         STATE(SETUP),
 137         STATE(PREPARED),
 138         STATE(RUNNING),
 139         STATE(XRUN),
 140         STATE(DRAINING),
 141         STATE(PAUSED),
 142         STATE(SUSPENDED),
 143 };
 144
 145 static char *snd_pcm_access_names[] = {
 146         ACCESS(MMAP_INTERLEAVED),
 147         ACCESS(MMAP_NONINTERLEAVED),
 148         ACCESS(MMAP_COMPLEX),
 149         ACCESS(RW_INTERLEAVED),
 150         ACCESS(RW_NONINTERLEAVED),
 151 };
 152
 153 static char *snd_pcm_format_names[] = {
 154         FORMAT(S8),
 155         FORMAT(U8),
 156         FORMAT(S16_LE),
 157         FORMAT(S16_BE),
 158         FORMAT(U16_LE),
 159         FORMAT(U16_BE),
 160         FORMAT(S24_LE),
 161         FORMAT(S24_BE),
 162         FORMAT(U24_LE),
 163         FORMAT(U24_BE),
 164         FORMAT(S32_LE),
 165         FORMAT(S32_BE),
 166         FORMAT(U32_LE),
 167         FORMAT(U32_BE),
 168         FORMAT(FLOAT_LE),
 169         FORMAT(FLOAT_BE),
 170         FORMAT(FLOAT64_LE),
 171         FORMAT(FLOAT64_BE),
 172         FORMAT(IEC958_SUBFRAME_LE),
 173         FORMAT(IEC958_SUBFRAME_BE),
 174         FORMAT(MU_LAW),
 175         FORMAT(A_LAW),
 176         FORMAT(IMA_ADPCM),
 177         FORMAT(MPEG),
 178         FORMAT(GSM),
 179         FORMAT(SPECIAL),
 180         FORMAT(S24_3LE),
 181         FORMAT(S24_3BE),
 182         FORMAT(U24_3LE),
 183         FORMAT(U24_3BE),
 184         FORMAT(S20_3LE),
 185         FORMAT(S20_3BE),
 186         FORMAT(U20_3LE),
 187         FORMAT(U20_3BE),
 188         FORMAT(S18_3LE),
 189         FORMAT(S18_3BE),
 190         FORMAT(U18_3LE),
 191         FORMAT(U18_3BE),
 192 };
 193
 194 static char *snd_pcm_subformat_names[] = {
 195         SUBFORMAT(STD),
 196 };
 197
 198 static char *snd_pcm_tstamp_mode_names[] = {
 199         TSTAMP(NONE),
 200         TSTAMP(MMAP),
 201 };
 202
 203 static const char *snd_pcm_stream_name(snd_pcm_stream_t stream)
 204 {
 205         snd_assert(stream <= SNDRV_PCM_STREAM_LAST, return NULL);
 206         return snd_pcm_stream_names[stream];
 207 }
 208
 209 static const char *snd_pcm_access_name(snd_pcm_access_t access)
 210 {
 211         snd_assert(access <= SNDRV_PCM_ACCESS_LAST, return NULL);
 212         return snd_pcm_access_names[access];
 213 }
 214
 215 const char *snd_pcm_format_name(snd_pcm_format_t format)
 216 {
 217         snd_assert(format <= SNDRV_PCM_FORMAT_LAST, return NULL);
 218         return snd_pcm_format_names[format];
 219 }
 220
 221 static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
 222 {
 223         snd_assert(subformat <= SNDRV_PCM_SUBFORMAT_LAST, return NULL);
 224         return snd_pcm_subformat_names[subformat];
 225 }
 226
 227 static const char *snd_pcm_tstamp_mode_name(snd_pcm_tstamp_t mode)
 228 {
 229         snd_assert(mode <= SNDRV_PCM_TSTAMP_LAST, return NULL);
 230         return snd_pcm_tstamp_mode_names[mode];
 231 }
 232
 233 static const char *snd_pcm_state_name(snd_pcm_state_t state)
 234 {
 235         snd_assert(state <= SNDRV_PCM_STATE_LAST, return NULL);
 236         return snd_pcm_state_names[state];
 237 }
 238
 239 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 240 #include <linux/soundcard.h>
 241 static const char *snd_pcm_oss_format_name(int format)
 242 {
 243         switch (format) {
 244         case AFMT_MU_LAW:
 245                 return "MU_LAW";
 246         case AFMT_A_LAW:
 247                 return "A_LAW";
 248         case AFMT_IMA_ADPCM:
 249                 return "IMA_ADPCM";
 250         case AFMT_U8:
 251                 return "U8";
 252         case AFMT_S16_LE:
 253                 return "S16_LE";
 254         case AFMT_S16_BE:
 255                 return "S16_BE";
 256         case AFMT_S8:
 257                 return "S8";
 258         case AFMT_U16_LE:
 259                 return "U16_LE";
 260         case AFMT_U16_BE:
 261                 return "U16_BE";
 262         case AFMT_MPEG:
 263                 return "MPEG";
 264         default:
 265                 return "unknown";
 266         }
 267 }
 268 #endif
 269
 270 #ifdef CONFIG_PROC_FS
 271 static void snd_pcm_proc_info_read(snd_pcm_substream_t *substream, snd_info_buffer_t *buffer)
 272 {
 273         snd_pcm_info_t *info;
 274         int err;
 275
 276         snd_runtime_check(substream, return);
 277
 278         info = kmalloc(sizeof(*info), GFP_KERNEL);
 279         if (! info) {
 280                 printk(KERN_DEBUG "snd_pcm_proc_info_read: cannot malloc\n");
 281                 return;
 282         }
 283
 284         err = snd_pcm_info(substream, info);
 285         if (err < 0) {
 286                 snd_iprintf(buffer, "error %d\n", err);
 287                 kfree(info);
 288                 return;
 289         }
 290         snd_iprintf(buffer, "card: %d\n", info->card);
 291         snd_iprintf(buffer, "device: %d\n", info->device);
 292         snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
 293         snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
 294         snd_iprintf(buffer, "id: %s\n", info->id);
 295         snd_iprintf(buffer, "name: %s\n", info->name);
 296         snd_iprintf(buffer, "subname: %s\n", info->subname);
 297         snd_iprintf(buffer, "class: %d\n", info->dev_class);
 298         snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
 299         snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
 300         snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
 301         kfree(info);
 302 }
 303
 304 static void snd_pcm_stream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 305 {
 306         snd_pcm_proc_info_read(((snd_pcm_str_t *)entry->private_data)->substream, buffer);
 307 }
 308
 309 static void snd_pcm_substream_proc_info_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 310 {
 311         snd_pcm_proc_info_read((snd_pcm_substream_t *)entry->private_data, buffer);
 312 }
 313
 314 static void snd_pcm_substream_proc_hw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 315 {
 316         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 317         snd_pcm_runtime_t *runtime = substream->runtime;
 318         if (!runtime) {
 319                 snd_iprintf(buffer, "closed\n");
 320                 return;
 321         }
 322         snd_pcm_stream_lock_irq(substream);
 323         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 324                 snd_iprintf(buffer, "no setup\n");
 325                 snd_pcm_stream_unlock_irq(substream);
 326                 return;
 327         }
 328         snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
 329         snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
 330         snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
 331         snd_iprintf(buffer, "channels: %u\n", runtime->channels);
 332         snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
 333         snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
 334         snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
 335         snd_iprintf(buffer, "tick_time: %u\n", runtime->tick_time);
 336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 337         if (substream->oss.oss) {
 338                 snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
 339                 snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
 340                 snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
 341                 snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
 342                 snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
 343                 snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
 344         }
 345 #endif
 346         snd_pcm_stream_unlock_irq(substream);
 347 }
 348
 349 static void snd_pcm_substream_proc_sw_params_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 350 {
 351         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 352         snd_pcm_runtime_t *runtime = substream->runtime;
 353         if (!runtime) {
 354                 snd_iprintf(buffer, "closed\n");
 355                 return;
 356         }
 357         snd_pcm_stream_lock_irq(substream);
 358         if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
 359                 snd_iprintf(buffer, "no setup\n");
 360                 snd_pcm_stream_unlock_irq(substream);
 361                 return;
 362         }
 363         snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
 364         snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
 365         snd_iprintf(buffer, "sleep_min: %u\n", runtime->sleep_min);
 366         snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
 367         snd_iprintf(buffer, "xfer_align: %lu\n", runtime->xfer_align);
 368         snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
 369         snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
 370         snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
 371         snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
 372         snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
 373         snd_pcm_stream_unlock_irq(substream);
 374 }
 375
 376 static void snd_pcm_substream_proc_status_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 377 {
 378         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)entry->private_data;
 379         snd_pcm_runtime_t *runtime = substream->runtime;
 380         snd_pcm_status_t status;
 381         int err;
 382         if (!runtime) {
 383                 snd_iprintf(buffer, "closed\n");
 384                 return;
 385         }
 386         memset(&status, 0, sizeof(status));
 387         err = snd_pcm_status(substream, &status);
 388         if (err < 0) {
 389                 snd_iprintf(buffer, "error %d\n", err);
 390                 return;
 391         }
 392         snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
 393         snd_iprintf(buffer, "trigger_time: %ld.%09ld\n",
 394                 status.trigger_tstamp.tv_sec, status.trigger_tstamp.tv_nsec);
 395         snd_iprintf(buffer, "tstamp      : %ld.%09ld\n",
 396                 status.tstamp.tv_sec, status.tstamp.tv_nsec);
 397         snd_iprintf(buffer, "delay       : %ld\n", status.delay);
 398         snd_iprintf(buffer, "avail       : %ld\n", status.avail);
 399         snd_iprintf(buffer, "avail_max   : %ld\n", status.avail_max);
 400         snd_iprintf(buffer, "-----\n");
 401         snd_iprintf(buffer, "hw_ptr      : %ld\n", runtime->status->hw_ptr);
 402         snd_iprintf(buffer, "appl_ptr    : %ld\n", runtime->control->appl_ptr);
 403 }
 404 #endif
 405
 406 #ifdef CONFIG_SND_DEBUG
 407 static void snd_pcm_xrun_debug_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 408 {
 409         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 410         snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
 411 }
 412
 413 static void snd_pcm_xrun_debug_write(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
 414 {
 415         snd_pcm_str_t *pstr = (snd_pcm_str_t *)entry->private_data;
 416         char line[64];
 417         if (!snd_info_get_line(buffer, line, sizeof(line)))
 418                 pstr->xrun_debug = simple_strtoul(line, NULL, 10);
 419 }
 420 #endif
 421
 422 static int snd_pcm_stream_proc_init(snd_pcm_str_t *pstr)
 423 {
 424         snd_pcm_t *pcm = pstr->pcm;
 425         snd_info_entry_t *entry;
 426         char name[16];
 427
 428         sprintf(name, "pcm%i%c", pcm->device,
 429                 pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
 430         if ((entry = snd_info_create_card_entry(pcm->card, name, pcm->card->proc_root)) == NULL)
 431                 return -ENOMEM;
 432         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 433         if (snd_info_register(entry) < 0) {
 434                 snd_info_free_entry(entry);
 435                 return -ENOMEM;
 436         }
 437         pstr->proc_root = entry;
 438
 439         if ((entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root)) != NULL) {
 440                 snd_info_set_text_ops(entry, pstr, 256, snd_pcm_stream_proc_info_read);
 441                 if (snd_info_register(entry) < 0) {
 442                         snd_info_free_entry(entry);
 443                         entry = NULL;
 444                 }
 445         }
 446         pstr->proc_info_entry = entry;
 447
 448 #ifdef CONFIG_SND_DEBUG
 449         if ((entry = snd_info_create_card_entry(pcm->card, "xrun_debug", pstr->proc_root)) != NULL) {
 450                 entry->c.text.read_size = 64;
 451                 entry->c.text.read = snd_pcm_xrun_debug_read;
 452                 entry->c.text.write_size = 64;
 453                 entry->c.text.write = snd_pcm_xrun_debug_write;
 454                 entry->private_data = pstr;
 455                 if (snd_info_register(entry) < 0) {
 456                         snd_info_free_entry(entry);
 457                         entry = NULL;
 458                 }
 459         }
 460         pstr->proc_xrun_debug_entry = entry;
 461 #endif
 462         return 0;
 463 }
 464
 465 static int snd_pcm_stream_proc_done(snd_pcm_str_t *pstr)
 466 {
 467 #ifdef CONFIG_SND_DEBUG
 468         if (pstr->proc_xrun_debug_entry) {
 469                 snd_info_unregister(pstr->proc_xrun_debug_entry);
 470                 pstr->proc_xrun_debug_entry = NULL;
 471         }
 472 #endif
 473         if (pstr->proc_info_entry) {
 474                 snd_info_unregister(pstr->proc_info_entry);
 475                 pstr->proc_info_entry = NULL;
 476         }
 477         if (pstr->proc_root) {
 478                 snd_info_unregister(pstr->proc_root);
 479                 pstr->proc_root = NULL;
 480         }
 481         return 0;
 482 }
 483
 484 static int snd_pcm_substream_proc_init(snd_pcm_substream_t *substream)
 485 {
 486         snd_info_entry_t *entry;
 487         snd_card_t *card;
 488         char name[16];
 489
 490         card = substream->pcm->card;
 491
 492         sprintf(name, "sub%i", substream->number);
 493         if ((entry = snd_info_create_card_entry(card, name, substream->pstr->proc_root)) == NULL)
 494                 return -ENOMEM;
 495         entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
 496         if (snd_info_register(entry) < 0) {
 497                 snd_info_free_entry(entry);
 498                 return -ENOMEM;
 499         }
 500         substream->proc_root = entry;
 501
 502         if ((entry = snd_info_create_card_entry(card, "info", substream->proc_root)) != NULL) {
 503                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_info_read);
 504                 if (snd_info_register(entry) < 0) {
 505                         snd_info_free_entry(entry);
 506                         entry = NULL;
 507                 }
 508         }
 509         substream->proc_info_entry = entry;
 510
 511         if ((entry = snd_info_create_card_entry(card, "hw_params", substream->proc_root)) != NULL) {
 512                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_hw_params_read);
 513                 if (snd_info_register(entry) < 0) {
 514                         snd_info_free_entry(entry);
 515                         entry = NULL;
 516                 }
 517         }
 518         substream->proc_hw_params_entry = entry;
 519
 520         if ((entry = snd_info_create_card_entry(card, "sw_params", substream->proc_root)) != NULL) {
 521                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_sw_params_read);
 522                 if (snd_info_register(entry) < 0) {
 523                         snd_info_free_entry(entry);
 524                         entry = NULL;
 525                 }
 526         }
 527         substream->proc_sw_params_entry = entry;
 528
 529         if ((entry = snd_info_create_card_entry(card, "status", substream->proc_root)) != NULL) {
 530                 snd_info_set_text_ops(entry, substream, 256, snd_pcm_substream_proc_status_read);
 531                 if (snd_info_register(entry) < 0) {
 532                         snd_info_free_entry(entry);
 533                         entry = NULL;
 534                 }
 535         }
 536         substream->proc_status_entry = entry;
 537
 538         return 0;
 539 }
 540
 541 static int snd_pcm_substream_proc_done(snd_pcm_substream_t *substream)
 542 {
 543         if (substream->proc_info_entry) {
 544                 snd_info_unregister(substream->proc_info_entry);
 545                 substream->proc_info_entry = NULL;
 546         }
 547         if (substream->proc_hw_params_entry) {
 548                 snd_info_unregister(substream->proc_hw_params_entry);
 549                 substream->proc_hw_params_entry = NULL;
 550         }
 551         if (substream->proc_sw_params_entry) {
 552                 snd_info_unregister(substream->proc_sw_params_entry);
 553                 substream->proc_sw_params_entry = NULL;
 554         }
 555         if (substream->proc_status_entry) {
 556                 snd_info_unregister(substream->proc_status_entry);
 557                 substream->proc_status_entry = NULL;
 558         }
 559         if (substream->proc_root) {
 560                 snd_info_unregister(substream->proc_root);
 561                 substream->proc_root = NULL;
 562         }
 563         return 0;
 564 }
 565
 566 /**
 567  * snd_pcm_new_stream - create a new PCM stream
 568  * @pcm: the pcm instance
 569  * @stream: the stream direction, SNDRV_PCM_STREAM_XXX
 570  * @substream_count: the number of substreams
 571  *
 572  * Creates a new stream for the pcm.
 573  * The corresponding stream on the pcm must have been empty before
 574  * calling this, i.e. zero must be given to the argument of
 575  * snd_pcm_new().
 576  *
 577  * Returns zero if successful, or a negative error code on failure.
 578  */
 579 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count)
 580 {
 581         int idx, err;
 582         snd_pcm_str_t *pstr = &pcm->streams[stream];
 583         snd_pcm_substream_t *substream, *prev;
 584
 585 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 586         init_MUTEX(&pstr->oss.setup_mutex);
 587 #endif
 588         pstr->stream = stream;
 589         pstr->pcm = pcm;
 590         pstr->substream_count = substream_count;
 591         pstr->reg = &snd_pcm_reg[stream];
 592         if (substream_count > 0) {
 593                 err = snd_pcm_stream_proc_init(pstr);
 594                 if (err < 0)
 595                         return err;
 596         }
 597         prev = NULL;
 598         for (idx = 0, prev = NULL; idx < substream_count; idx++) {
 599                 substream = kcalloc(1, sizeof(*substream), GFP_KERNEL);
 600                 if (substream == NULL)
 601                         return -ENOMEM;
 602                 substream->pcm = pcm;
 603                 substream->pstr = pstr;
 604                 substream->number = idx;
 605                 substream->stream = stream;
 606                 sprintf(substream->name, "subdevice #%i", idx);
 607                 substream->buffer_bytes_max = UINT_MAX;
 608                 if (prev == NULL)
 609                         pstr->substream = substream;
 610                 else
 611                         prev->next = substream;
 612                 err = snd_pcm_substream_proc_init(substream);
 613                 if (err < 0) {
 614                         kfree(substream);
 615                         return err;
 616                 }
 617                 substream->group = &substream->self_group;
 618                 spin_lock_init(&substream->self_group.lock);
 619                 INIT_LIST_HEAD(&substream->self_group.substreams);
 620                 list_add_tail(&substream->link_list, &substream->self_group.substreams);
 621                 spin_lock_init(&substream->timer_lock);
 622                 prev = substream;
 623         }
 624         return 0;
 625 }
 626
 627 /**
 628  * snd_pcm_new - create a new PCM instance
 629  * @card: the card instance
 630  * @id: the id string
 631  * @device: the device index (zero based)
 632  * @playback_count: the number of substreams for playback
 633  * @capture_count: the number of substreams for capture
 634  * @rpcm: the pointer to store the new pcm instance
 635  *
 636  * Creates a new PCM instance.
 637  *
 638  * The pcm operators have to be set afterwards to the new instance
 639  * via snd_pcm_set_ops().
 640  *
 641  * Returns zero if successful, or a negative error code on failure.
 642  */
 643 int snd_pcm_new(snd_card_t * card, char *id, int device,
 644                 int playback_count, int capture_count,
 645                 snd_pcm_t ** rpcm)
 646 {
 647         snd_pcm_t *pcm;
 648         int err;
 649         static snd_device_ops_t ops = {
 650                 .dev_free = snd_pcm_dev_free,
 651                 .dev_register = snd_pcm_dev_register,
 652                 .dev_disconnect = snd_pcm_dev_disconnect,
 653                 .dev_unregister = snd_pcm_dev_unregister
 654         };
 655
 656         snd_assert(rpcm != NULL, return -EINVAL);
 657         *rpcm = NULL;
 658         snd_assert(card != NULL, return -ENXIO);
 659         pcm = kcalloc(1, sizeof(*pcm), GFP_KERNEL);
 660         if (pcm == NULL)
 661                 return -ENOMEM;
 662         pcm->card = card;
 663         pcm->device = device;
 664         if (id) {
 665                 strlcpy(pcm->id, id, sizeof(pcm->id));
 666         }
 667         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK, playback_count)) < 0) {
 668                 snd_pcm_free(pcm);
 669                 return err;
 670         }
 671         if ((err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count)) < 0) {
 672                 snd_pcm_free(pcm);
 673                 return err;
 674         }
 675         init_MUTEX(&pcm->open_mutex);
 676         init_waitqueue_head(&pcm->open_wait);
 677         if ((err = snd_device_new(card, SNDRV_DEV_PCM, pcm, &ops)) < 0) {
 678                 snd_pcm_free(pcm);
 679                 return err;
 680         }
 681         *rpcm = pcm;
 682         return 0;
 683 }
 684
 685 static void snd_pcm_free_stream(snd_pcm_str_t * pstr)
 686 {
 687         snd_pcm_substream_t *substream, *substream_next;
 688 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 689         snd_pcm_oss_setup_t *setup, *setupn;
 690 #endif
 691         substream = pstr->substream;
 692         while (substream) {
 693                 substream_next = substream->next;
 694                 snd_pcm_substream_proc_done(substream);
 695                 kfree(substream);
 696                 substream = substream_next;
 697         }
 698         snd_pcm_stream_proc_done(pstr);
 699 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 700         for (setup = pstr->oss.setup_list; setup; setup = setupn) {
 701                 setupn = setup->next;
 702                 kfree(setup->task_name);
 703                 kfree(setup);
 704         }
 705 #endif
 706 }
 707
 708 static int snd_pcm_free(snd_pcm_t *pcm)
 709 {
 710         snd_assert(pcm != NULL, return -ENXIO);
 711         if (pcm->private_free)
 712                 pcm->private_free(pcm);
 713         snd_pcm_lib_preallocate_free_for_all(pcm);
 714         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
 715         snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
 716         kfree(pcm);
 717         return 0;
 718 }
 719
 720 static int snd_pcm_dev_free(snd_device_t *device)
 721 {
 722         snd_pcm_t *pcm = device->device_data;
 723         return snd_pcm_free(pcm);
 724 }
 725
 726 static void snd_pcm_tick_timer_func(unsigned long data)
 727 {
 728         snd_pcm_substream_t *substream = (snd_pcm_substream_t*) data;
 729         snd_pcm_tick_elapsed(substream);
 730 }
 731
 732 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream,
 733                            snd_pcm_substream_t **rsubstream)
 734 {
 735         snd_pcm_str_t * pstr;
 736         snd_pcm_substream_t * substream;
 737         snd_pcm_runtime_t * runtime;
 738         snd_ctl_file_t *kctl;
 739         snd_card_t *card;
 740         struct list_head *list;
 741         int prefer_subdevice = -1;
 742         size_t size;
 743
 744         snd_assert(rsubstream != NULL, return -EINVAL);
 745         *rsubstream = NULL;
 746         snd_assert(pcm != NULL, return -ENXIO);
 747         pstr = &pcm->streams[stream];
 748         if (pstr->substream == NULL)
 749                 return -ENODEV;
 750
 751         card = pcm->card;
 752         down_read(&card->controls_rwsem);
 753         list_for_each(list, &card->ctl_files) {
 754                 kctl = snd_ctl_file(list);
 755                 if (kctl->pid == current->pid) {
 756                         prefer_subdevice = kctl->prefer_pcm_subdevice;
 757                         break;
 758                 }
 759         }
 760         up_read(&card->controls_rwsem);
 761
 762         if (pstr->substream_count == 0)
 763                 return -ENODEV;
 764         switch (stream) {
 765         case SNDRV_PCM_STREAM_PLAYBACK:
 766                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 767                         for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; substream; substream = substream->next) {
 768                                 if (SUBSTREAM_BUSY(substream))
 769                                         return -EAGAIN;
 770                         }
 771                 }
 772                 break;
 773         case SNDRV_PCM_STREAM_CAPTURE:
 774                 if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
 775                         for (substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; substream; substream = substream->next) {
 776                                 if (SUBSTREAM_BUSY(substream))
 777                                         return -EAGAIN;
 778                         }
 779                 }
 780                 break;
 781         default:
 782                 return -EINVAL;
 783         }
 784
 785         if (prefer_subdevice >= 0) {
 786                 for (substream = pstr->substream; substream; substream = substream->next)
 787                         if (!SUBSTREAM_BUSY(substream) && substream->number == prefer_subdevice)
 788                                 goto __ok;
 789         }
 790         for (substream = pstr->substream; substream; substream = substream->next)
 791                 if (!SUBSTREAM_BUSY(substream))
 792                         break;
 793       __ok:
 794         if (substream == NULL)
 795                 return -EAGAIN;
 796
 797         runtime = kcalloc(1, sizeof(*runtime), GFP_KERNEL);
 798         if (runtime == NULL)
 799                 return -ENOMEM;
 800
 801         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t));
 802         runtime->status = snd_malloc_pages(size, GFP_KERNEL);
 803         if (runtime->status == NULL) {
 804                 kfree(runtime);
 805                 return -ENOMEM;
 806         }
 807         memset((void*)runtime->status, 0, size);
 808
 809         size = PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t));
 810         runtime->control = snd_malloc_pages(size, GFP_KERNEL);
 811         if (runtime->control == NULL) {
 812                 snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 813                 kfree(runtime);
 814                 return -ENOMEM;
 815         }
 816         memset((void*)runtime->control, 0, size);
 817
 818         init_waitqueue_head(&runtime->sleep);
 819         atomic_set(&runtime->mmap_count, 0);
 820         init_timer(&runtime->tick_timer);
 821         runtime->tick_timer.function = snd_pcm_tick_timer_func;
 822         runtime->tick_timer.data = (unsigned long) substream;
 823
 824         runtime->status->state = SNDRV_PCM_STATE_OPEN;
 825
 826         substream->runtime = runtime;
 827         substream->private_data = pcm->private_data;
 828         pstr->substream_opened++;
 829         *rsubstream = substream;
 830         return 0;
 831 }
 832
 833 void snd_pcm_release_substream(snd_pcm_substream_t *substream)
 834 {
 835         snd_pcm_runtime_t * runtime;
 836         substream->file = NULL;
 837         runtime = substream->runtime;
 838         snd_assert(runtime != NULL, return);
 839         if (runtime->private_free != NULL)
 840                 runtime->private_free(runtime);
 841         snd_free_pages((void*)runtime->status, PAGE_ALIGN(sizeof(snd_pcm_mmap_status_t)));
 842         snd_free_pages((void*)runtime->control, PAGE_ALIGN(sizeof(snd_pcm_mmap_control_t)));
 843         kfree(runtime->hw_constraints.rules);
 844         kfree(runtime);
 845         substream->runtime = NULL;
 846         substream->pstr->substream_opened--;
 847 }
 848
 849 static int snd_pcm_dev_register(snd_device_t *device)
 850 {
 851         int idx, cidx, err;
 852         unsigned short minor;
 853         snd_pcm_substream_t *substream;
 854         struct list_head *list;
 855         char str[16];
 856         snd_pcm_t *pcm = device->device_data;
 857
 858         snd_assert(pcm != NULL && device != NULL, return -ENXIO);
 859         down(&register_mutex);
 860         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 861         if (snd_pcm_devices[idx]) {
 862                 up(&register_mutex);
 863                 return -EBUSY;
 864         }
 865         snd_pcm_devices[idx] = pcm;
 866         for (cidx = 0; cidx < 2; cidx++) {
 867                 int devtype = -1;
 868                 if (pcm->streams[cidx].substream == NULL)
 869                         continue;
 870                 switch (cidx) {
 871                 case SNDRV_PCM_STREAM_PLAYBACK:
 872                         sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device);
 873                         minor = SNDRV_MINOR_PCM_PLAYBACK + idx;
 874                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 875                         break;
 876                 case SNDRV_PCM_STREAM_CAPTURE:
 877                         sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device);
 878                         minor = SNDRV_MINOR_PCM_CAPTURE + idx;
 879                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 880                         break;
 881                 }
 882                 if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
 883                         snd_pcm_devices[idx] = NULL;
 884                         up(&register_mutex);
 885                         return err;
 886                 }
 887                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 888                         snd_pcm_timer_init(substream);
 889         }
 890         list_for_each(list, &snd_pcm_notify_list) {
 891                 snd_pcm_notify_t *notify;
 892                 notify = list_entry(list, snd_pcm_notify_t, list);
 893                 notify->n_register(pcm);
 894         }
 895         up(&register_mutex);
 896         return 0;
 897 }
 898
 899 static int snd_pcm_dev_disconnect(snd_device_t *device)
 900 {
 901         snd_pcm_t *pcm = device->device_data;
 902         struct list_head *list;
 903         snd_pcm_substream_t *substream;
 904         int idx, cidx;
 905
 906         down(&register_mutex);
 907         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 908         snd_pcm_devices[idx] = NULL;
 909         for (cidx = 0; cidx < 2; cidx++)
 910                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 911                         if (substream->runtime)
 912                                 substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED;
 913         list_for_each(list, &snd_pcm_notify_list) {
 914                 snd_pcm_notify_t *notify;
 915                 notify = list_entry(list, snd_pcm_notify_t, list);
 916                 notify->n_disconnect(pcm);
 917         }
 918         up(&register_mutex);
 919         return 0;
 920 }
 921
 922 static int snd_pcm_dev_unregister(snd_device_t *device)
 923 {
 924         int idx, cidx, devtype;
 925         snd_pcm_substream_t *substream;
 926         struct list_head *list;
 927         snd_pcm_t *pcm = device->device_data;
 928
 929         snd_assert(pcm != NULL, return -ENXIO);
 930         down(&register_mutex);
 931         idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device;
 932         snd_pcm_devices[idx] = NULL;
 933         for (cidx = 0; cidx < 2; cidx++) {
 934                 devtype = -1;
 935                 switch (cidx) {
 936                 case SNDRV_PCM_STREAM_PLAYBACK:
 937                         devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
 938                         break;
 939                 case SNDRV_PCM_STREAM_CAPTURE:
 940                         devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 941                         break;
 942                 }
 943                 snd_unregister_device(devtype, pcm->card, pcm->device);
 944                 for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
 945                         snd_pcm_timer_done(substream);
 946         }
 947         list_for_each(list, &snd_pcm_notify_list) {
 948                 snd_pcm_notify_t *notify;
 949                 notify = list_entry(list, snd_pcm_notify_t, list);
 950                 notify->n_unregister(pcm);
 951         }
 952         up(&register_mutex);
 953         return snd_pcm_free(pcm);
 954 }
 955
 956 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree)
 957 {
 958         int idx;
 959
 960         snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL);
 961         down(&register_mutex);
 962         if (nfree) {
 963                 list_del(&notify->list);
 964                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 965                         if (snd_pcm_devices[idx] == NULL)
 966                                 continue;
 967                         notify->n_unregister(snd_pcm_devices[idx]);
 968                 }
 969         } else {
 970                 list_add_tail(&notify->list, &snd_pcm_notify_list);
 971                 for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 972                         if (snd_pcm_devices[idx] == NULL)
 973                                 continue;
 974                         notify->n_register(snd_pcm_devices[idx]);
 975                 }
 976         }
 977         up(&register_mutex);
 978         return 0;
 979 }
 980
 981 /*
 982  *  Info interface
 983  */
 984
 985 static void snd_pcm_proc_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
 986 {
 987         int idx;
 988         snd_pcm_t *pcm;
 989
 990         down(&register_mutex);
 991         for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) {
 992                 pcm = snd_pcm_devices[idx];
 993                 if (pcm == NULL)
 994                         continue;
 995                 snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES,
 996                             idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name);
 997                 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
 998                         snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
 999                 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
1000                         snd_iprintf(buffer, " : capture %i", pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
1001                 snd_iprintf(buffer, "\n");
1002         }
1003         up(&register_mutex);
1004 }
1005
1006 /*
1007  *  ENTRY functions
1008  */
1009
1010 static snd_info_entry_t *snd_pcm_proc_entry = NULL;
1011
1012 static int __init alsa_pcm_init(void)
1013 {
1014         snd_info_entry_t *entry;
1015
1016         snd_ctl_register_ioctl(snd_pcm_control_ioctl);
1017         snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
1018         if ((entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL)) != NULL) {
1019                 snd_info_set_text_ops(entry, NULL, SNDRV_CARDS * SNDRV_PCM_DEVICES * 128, snd_pcm_proc_read);
1020                 if (snd_info_register(entry) < 0) {
1021                         snd_info_free_entry(entry);
1022                         entry = NULL;
1023                 }
1024         }
1025         snd_pcm_proc_entry = entry;
1026         return 0;
1027 }
1028
1029 static void __exit alsa_pcm_exit(void)
1030 {
1031         snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
1032         snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
1033         if (snd_pcm_proc_entry) {
1034                 snd_info_unregister(snd_pcm_proc_entry);
1035                 snd_pcm_proc_entry = NULL;
1036         }
1037 }
1038
1039 module_init(alsa_pcm_init)
1040 module_exit(alsa_pcm_exit)
1041
1042 EXPORT_SYMBOL(snd_pcm_devices);
1043 EXPORT_SYMBOL(snd_pcm_new);
1044 EXPORT_SYMBOL(snd_pcm_new_stream);
1045 EXPORT_SYMBOL(snd_pcm_notify);
1046 EXPORT_SYMBOL(snd_pcm_open_substream);
1047 EXPORT_SYMBOL(snd_pcm_release_substream);
1048 EXPORT_SYMBOL(snd_pcm_format_name);
1049   /* pcm_native.c */
1050 EXPORT_SYMBOL(snd_pcm_link_rwlock);
1051 EXPORT_SYMBOL(snd_pcm_start);
1052 #ifdef CONFIG_PM
1053 EXPORT_SYMBOL(snd_pcm_suspend);
1054 EXPORT_SYMBOL(snd_pcm_suspend_all);
1055 #endif
1056 EXPORT_SYMBOL(snd_pcm_kernel_playback_ioctl);
1057 EXPORT_SYMBOL(snd_pcm_kernel_capture_ioctl);
1058 EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
1059 EXPORT_SYMBOL(snd_pcm_mmap_data);
1060 #if SNDRV_PCM_INFO_MMAP_IOMEM
1061 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
1062 #endif
1063  /* pcm_misc.c */
1064 EXPORT_SYMBOL(snd_pcm_format_signed);
1065 EXPORT_SYMBOL(snd_pcm_format_unsigned);
1066 EXPORT_SYMBOL(snd_pcm_format_linear);
1067 EXPORT_SYMBOL(snd_pcm_format_little_endian);
1068 EXPORT_SYMBOL(snd_pcm_format_big_endian);
1069 EXPORT_SYMBOL(snd_pcm_format_width);
1070 EXPORT_SYMBOL(snd_pcm_format_physical_width);
1071 EXPORT_SYMBOL(snd_pcm_format_silence_64);
1072 EXPORT_SYMBOL(snd_pcm_format_set_silence);
1073 EXPORT_SYMBOL(snd_pcm_build_linear_format);
1074 EXPORT_SYMBOL(snd_pcm_limit_hw_rates);